title: A highly porous 4,4-paddlewheel-connected NbO-type metal-organic framework with a large gas-uptake capacity.
abstract: A highly porous 4,4-paddlewheel-connected NbO-type metal-organic framework (HNUST-2, HNUST represents Hunan University of Science and Technology) has been designed and synthesized by self-assembling [Cu₂(COO)₄] SBUs with a nanosized tetracarboxylate ligand prolonged by alkyne groups, 5,5'-(naphthalene-1,4-diylbis(ethyne-2,1-diyl))diisophthalic acid (H₄NDED). HNUST-2 exhibits high structural stability, a porous non-interpenetration framework with open metal sites and excellent gas-uptake capacity. This MOF material possesses a high BET surface area of 2366 m² g⁻¹, a large unsaturated excess and total H₂ uptake of 4.57 wt% and 5. 20 wt% at 20 bar and 77 K, respectively. Meanwhile, HNUST-2 also exhibits an excellent adsorption capacity for CO₂ (18.07 mmol g⁻¹ at 20 bar and 298 K) and CH₄ (85.6 cm³ cm⁻³ at 20 bar and 298 K) with a high selectivity for CO₂ over N₂ (22.9) and CH₄ (4.9) at 298 K.
authors.affiliation: Key Laboratory of Theoretical Chemistry and Molecular Simulation of Ministry of Education, School of Chemistry and Chemical Engineering, Hunan University of Science and Technology, Xiangtan 411201, People's Republic of China.
authors.forename: Zhaoxu
authors.initials: Z
authors.lastname: Wang
authors.forename: Baishu
authors.initials: B
authors.lastname: Zheng
authors.forename: Heting
authors.initials: H
authors.lastname: Liu
authors.forename: Pinggui
authors.initials: P
authors.lastname: Yi
authors.forename: Xiaofang
authors.initials: X
authors.lastname: Li
authors.forename: Xianyong
authors.initials: X
authors.lastname: Yu
authors.forename: Ruirui
authors.initials: R
authors.lastname: Yun